Figure2: (a) The main power switch is at the back-panel of the compressor is turned off. To turn it on, rotate the
black switch by 90 deg (ref Figure 6). (b) Front panel switch and the operating hours of the He-compressor.
40088.7h are elapsed as shown in the front panel reading. The maximum operating hours of the instrument
without maintenance is 30,000h. After that the regular service of the He-compressor is recommended-especially
adsorber has to be replaced.
There are two ways to do service on He-compressor and cold-head servicing if the Cold-head or the He-compressor
is contaminated or needs a service. If the compressor/cold-head parts are performing well and only if the parts are
exposed to air, Sumitomo can do an onsite service. Also they can do the adsorber replacement. However if the
motor capsule needs a replacement, then most likely the instrument has to go to the Sumitomo Chicago facility for
service (but check with Roy Roub if they can replace the capsule also by an onsite service). Sumitomo can send a
reconditioned and qualified end/displacer assembly upon request (contact Roy Roub for pricing). Prior
to reconnecting flux lines and the He-compressor, make sure those parts are clean and not
contaminated and also filled with Helium gas (99.999% purity). Please check the price quote prior to
sending the parts to Sumitomo and making an onsite service (onsite service is pricy but faster).
Note: If the cold head or flux line is contaminated (or exposed to air) as judged by the pressure
reading at the He-compressor, the compressor should not be switched on. Contact Roy Roub at
Sumitomo Inc. to proceed further with the repair/service. The cold-head can be removed from the
magnet and can be send out for repair (special care should be taken to release the excess He-gas
residing inside the cold-head prior to unscrewing the 4 screws as shown in the Figure3, for that
appropriate fittings should be used-contact Roy Roub to buy the fittings and couplings.
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